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Note 9 - Income Taxes - Provision for Income Taxes Differs from the Amount Computed by Applying the Statutory Federal Income Tax Rate (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income for the year before provision for income taxes	$ 24,074,768	$ 25,112,924	$ 17,942,957
Computed tax expense	8,185,420	8,538,245	6,100,605
State income taxes	656,603	530,803	265,489
Effect of the decrease in Federal tax rate on deferred taxes	(10,036,080)
Valuation allowance on pre-2017 Foreign Tax Credits	1,275,937
Non-creditable 2017 Foreign Tax	2,903,400
Excess tax benefits on share-based compensation expense	(2,796,171)
Permanent differences	1,635,611	290,327	278,959
Others	(76,546)	(313,605)	(75,826)
Provision for income taxes	$ 1,748,174	$ 9,045,770	$ 6,569,227

X

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to change in valuation allowance on pre-2017 foreign tax credits.

+ References

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to effect of decrease in Federal Tax Rate on deferred taxes.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to non-creditable 2017 foreign tax.

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost.

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1)(i))
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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